Question

即使使用IntVar（），我也无法更新标签内的变量。我可能正在做一些长期错误的事情。试图做一个Nim游戏，通过改变变量来更新标签。

        # ministry of trade
        from tkinter import *
        import random

        # create root window
        root = Tk()

        # ministry of variables
        lst_choice = [1,2]
        lst_player = [1,2]
        player=random.choice(lst_player) #set random player
        playervar = StringVar()
        playervar.set(player)

        # Set the initial state
        state=7    # number of objects
        statevar = IntVar()
        statevar.set(state)

        winner=0
        winnervar = IntVar()
        winnervar.set(winner)

        move=0
        movevar = IntVar()
        movevar.set(move)

        def move1():
                                                                # move is assigned
                global statevar
                global playervar
                global winnervar

                if statevar.get()>0:
                    statevar.set(statevar.get() - 1)
                    print(statevar.get())                   #for testing only
                    return statevar

                if statevar.get()==0:                # check win status - win, lose, stalemate
                    winnervar.set(playervar.get())
                    print(winnervar.get())                  #for testing only
                    return winnervar

                if playervar.get()==1:            # switch players 2->1, 1->2 go back to the valid move line
                    playervar.set(2)
                    print(playervar.get())                  #for testing only
                    return playervar

                else:
                    playervar.set(1)
                    print(playervar.get())                  #for testing only
                    return playervar
                root.update_idletasks()
        def move2():
            return
        # Holy Roman Empire of the Widget Nation
        # electorate of Label

        labelAantalMunten = Label(root, text=("Aantal munten op stapel ",statevar.get()))    #state
        labelAantalMunten.pack() # orders to add the widget label to the root window and display it

        labelWelkSpeler = Label(root, text=("Nu is speler ",playervar.get()," aan de beurt"))  #player
        labelWelkSpeler.pack()

        labelWelkWinaar = Label(root, text=("Speler ",winnervar.get()," heeft gewonnen!"))  #winner
        labelWelkWinaar.pack()

        # electorate of Button
        button1 = Button(root, text="neem 1 steen", command=move1)
        button1.pack()

        button2 = Button(root, text="neem 2 stenen", command=move2)
        button2.pack()


        # start the main events loop    
        root.mainloop()

Answer 1

以下是每次按下按钮后应更新标签的示例。

您需要在标签中使用textvariable代替text。
您需要在主代码中声明一个StringVar变量，并在函数mov1中更新它。
请注意我的示例，了解如何在将字符串传递到您的字符串之前获取字符串 StingVar变量。

玩得开心！

示例代码

# ministry of trade
from tkinter import *
import random

# create root window
root = Tk()

# Set the initial state
state=7    # number of objects
statevar = IntVar()
statevar.set(state)

def move1():
                                # move is assigned
    global statevar

    if statevar.get()>0:
        print('statevar.get()>0')
        print(statevar.get())   #for testing only
        statevar.set(statevar.get() - 1)
        print(statevar.get())   #for testing only
        a = "Aantal munten op stapel " + str(statevar.get())
        print('a = {}'.format(a))
        text1.set(a)
        return statevar

a = "Aantal munten op stapel " + str(statevar.get())
text1=StringVar()
text1.set(a)
labelAantalMunten = Label(root, textvariable=text1)    #state
labelAantalMunten.pack() # orders to add the widget label to the root window and display it

# electorate of Button
button1 = Button(root, text="neem 1 steen", command=move1)
button1.pack()

# start the main events loop    
root.mainloop()

Answer 2

    labelWelkSpeler = Label(root, text=("Nu is speler ",playervar.get()," aan de beurt"))  #player

这将获取playervar ONCE的值（在您创建标签时），并在此时构建标签的文本。（并且可能没有构建你真正想要的文本，因为你写的是一个元组结构，而不是字符串连接。）每次playervar改变时，它都不会神奇地导致重新运行这个代码！

从变量中自动更新Label的唯一方法是将其指定为textvariable=选项，而不是text=。变量必须保持要显示的整个文本，因此它几乎肯定是StringVar，而不是IntVar。你需要将玩家得分保持在一个单独的变量（一个普通的Python变量，最有可能），然后.set（）StringVar自己随时改变。

Python 3 Tkinter如何刷新/更新标签？尼姆游戏

2 个答案: